Piezoelectric materials turn mechanical stress, like pressure, sound waves, and other vibrations into electricity and vice versa.

压电材料将压力、声波和其他振动等机械应力转化为电能，反之亦然。

Also, joint injury, which brings with it a lot of inflammation, seems to be a major risk factor for osteoarthritis, as well as mechanical stress and obesity.

同时关节损伤也会带来大量炎症反应，这也成为骨关节炎的一个重要危险因素，此外还有机械压力和肥胖因素等。